1212221222211 has 12 divisors (see below), whose sum is σ = 1639380331016. Its totient is φ = 796765112640.

The previous prime is 1212221222203. The next prime is 1212221222237. The reversal of 1212221222211 is 1122221222121.

It is not a de Polignac number, because 1212221222211 - 2³ = 1212221222203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212221222281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40063606 + ... + 40093851.

Almost surely, 2^{1212221222211} is an apocalyptic number.

1212221222211 is a deficient number, since it is larger than the sum of its proper divisors (427159108805).

1212221222211 is an frugal number, since it uses more digits than its factorization.

1212221222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80157602 (or 80157531 counting only the distinct ones).

The product of its digits is 256, while the sum is 21.

Adding to 1212221222211 its reverse (1122221222121), we get a palindrome (2334442444332).

The spelling of 1212221222211 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".